The first episode, where Sean and Kevin show off just how Badass they are against beating the crap out of a multitude of Swabots. The Redux version of this scene is even better.
Episode 23, fittingly called "Mandla's Finest Hour". He shows he's not a Replacement Scrappy and kicks the crap out of Zordonian soldiers and Swabots.
Episode 4, where the Rangers are fighting Rashon's court. The Zordonians have the advantage at first, but Sean shouts "WE'RE NOT DONE YET!!", the Rangers fight back, and win.
The arrival of the Silver Ranger in episode 25. Gargotron had the GPX and Flash Rangers down for the count when someone in a trenchcoat shows up, morphs, and beats Gargotron! Okay, so maybe Gargotron didn't have the guy's fight data, but it was still impressive.
SIU Examples:
Marty in SIU, showing worthy of being a Ranger by punching the local Dark Mistress. In the face!
Sean, Maria and Aaron (Mandla) get credit for fighting an Ouroboros Society monster while hungover!
